Isn’t it strange that I who have written only unpopular books should be such a popular fellow?

God may be subtle, but he isn’t plain mean.

I believe that a simple and unassuming manner of life is best for everyone, best both for the body and the mind.

I do not believe in the God of theology who rewards good and punishes evil.

I never think of the future – it comes soon enough.

If you can’t explain it simply, you don’t understand it well enough.

If people are good only because they fear punishment, and hope for reward, then we are a sorry lot indeed.

Imagination is everything. It is the preview of life’s coming attractions.

Information is not knowledge.

Intellectual growth should commence at birth and cease only at death.

Intellectuals solve problems, geniuses prevent them.

It is a miracle that curiosity survives formal education.

It is the supreme art of the teacher to awaken joy in creative expression and knowledge.

It should be possible to explain the laws of physics to a barmaid.

It’s not that I’m so smart, it’s just that I stay with problems longer.

Joy in looking and comprehending is nature’s most beautiful gift.

Knowledge of what is does not open the door directly to what should be.

Learn from yesterday, live for today, hope for tomorrow. The important thing is not to stop questioning.

Morality is of the highest importance – but for us, not for God.